Latest revision as of 00:44, 25 May 2013

To test for bugs regarding interactions with other extensions or corrupted profiles, you should do the following. Firefox and Firebug re-install rarely fixes problems because the configuration files are not altered on reinstall. So to clear out the configuration files you need to create a new Firefox profile:

If you use Firefox 3.6 or earlier you should see the Firebug icon in the status bar. Starting from Firefox 4.0 the Firebug Start Button moved to the toolbar. If it's not visible there, it can be found inside the Customize Toolbar dialog. For more info about this please read Honza's blog post.

With Firefox closed, locate your profile directory, delete these temporary files, they will be automatically re-created by Firefox:extensions.iniextensions.cacheextensions.rdfcompreg.dat

Disable any Antivirus or Backup program you may have running and then install Firebug.It may be that some software is stopping Firefox creating the file structures needed for the installation process.

Run Firefox as Administrator. It may be the same as in reason 2, because firefox doesn't have enough permissions.

Manually install Firebug.This can be done easily, just unzip the XPI (it's a normal zipped file with the extension changed) in your extensions folder, inside your profile. You should unzip firebug's XPI content inside a folder named 'firebug@software.joehewitt.com'. Do this with Firefox closed.

To get the XPI go to Firebug on addons.mozilla.org (AMO), right click on the "Add to Firefox" button and select Save Link As....

If your problem didn't get solved or your error message is not listed above: